JP2019211682A - Lens assembly, imaging apparatus, and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens assembly capable of adjusting an air gap with a simple structure. A lens assembly (4) includes a lens group (20) including lenses (21 to 25), a lens holder (10) holding the lens group (20), and light shielding plates (80 to 82). The lens group 20 includes a pair of lenses 22, 23, a pair of lenses 23, 24, and a pair of lenses 24, 25, which are adjacent to each other and form an air gap. The shading plate 80 is arranged between the front lens 22 and the rear lens 23, the shading plate 81 is arranged between the front lens 23 and the rear lens 24, and the shading plate 82 is arranged between the front lens 24 and the rear lens 25. Is located in. The air gap between the front lens and the rear lens is adjusted to the design air gap G1 to G3 by the thickness of the light shielding plates 80 to 82. [Selection diagram] Fig. 10

Description

  The present invention relates to a lens assembly, an imaging apparatus, and an electronic apparatus, and more particularly to a lens assembly including a plurality of lenses.

  Recently, camera modules (imaging devices) are mounted on various electronic devices such as smartphones, tablet computers, and drones. Many of these camera modules incorporate a lens assembly, and most of the lens assemblies have a plurality of lenses and a lens holder (lens barrel) that holds the plurality of lenses. .

  By the way, since such a lens assembly is composed of a plurality of lenses as described above, in order to obtain desired optical characteristics, the lens interval (air interval) is manufactured to a predetermined design value. It is preferable. In practice, however, many lens assemblies are produced with the air spacing deviating from the design value due to various tolerances. Therefore, a lens assembly is known in which an adjustment member is attached to a lens holder so that the air gap can be adjusted as appropriate (see, for example, Patent Document 1).

  However, in such a configuration of Patent Document 1, since it is necessary to separately attach the adjustment member to the lens holder using a fixture such as a screw, the number of parts increases, the structure becomes complicated, and the lens assembly becomes large. Invitation For this reason, there is a problem that it is difficult to apply to a small electronic device such as a smartphone.

Japanese Patent Laying-Open No. 2006-161641

  The present invention has been made in view of the above-described problems of the prior art, and a first object thereof is to provide a lens assembly capable of adjusting the air interval with a simple structure.

  A second object of the present invention is to provide an imaging device with good optical characteristics.

  Furthermore, a third object of the present invention is to provide an electronic apparatus including an imaging device with good optical characteristics.

  According to the first aspect of the present invention, a lens assembly capable of adjusting the air gap with a simple structure is provided. The lens assembly includes a lens group including a plurality of lenses, a lens holder that holds the lens group, and at least one light-shielding plate that blocks stray light from the lens group. The lens group includes at least one lens pair including an anterior lens and an posterior lens that are adjacent to each other while forming an air gap in the optical axis direction. The light shielding plate is disposed between the front lens and the rear lens in at least one of the at least one lens pair. And the said air space | interval is adjusted to the design air space | interval which is a design value with the thickness in the said optical axis direction of the said light-shielding plate.

  According to such a configuration, since the air gap can be adjusted by the thickness of the light shielding plate disposed between the front lens and the rear lens, the air gap can be reduced with a simple structure without causing a complicated structure. Can be adjusted to the design air spacing.

  Here, the thickness of the light shielding plate is preferably adjusted so that a rear end portion of the lens group in the optical axis direction is positioned inside the lens holder. According to such a configuration, since the rearmost lens does not protrude from the lens holder, the rearmost lens may come into contact with other members during the operation of the imaging device or the manufacturing of the imaging device. Is prevented.

  Moreover, it is preferable that the said light shielding plate is formed in the outer diameter below the internal diameter of the said lens holder, and an internal diameter larger than the effective diameter of the said back lens. According to such a configuration, the light transmitted through the lens group is prevented from being obstructed by the light shielding plate.

  Here, the one light shielding plate may be disposed between the front lens and the rear lens. Thereby, the structure of a lens assembly can be simplified effectively. On the other hand, in another aspect, a plurality of light shielding plates may be disposed between the front lens and the rear lens. For example, two light shielding plates may be disposed between the front lens and the rear lens. Thereby, it becomes possible to adjust an air space | interval more finely.

  By the way, the lens group may include a first lens group positioned on the front side in the optical axis direction and a second lens group positioned on the rear side in the optical axis direction. The lens holder includes a first holding unit that holds the first lens group, a second holding unit that holds the second lens group, the first holding unit, and the second holding unit. You may have a connection part which connects the said 1st holding part and the said 2nd holding part so that the insertion space which can insert a light control part between the holding parts may be formed. In this case, it is preferable that the light shielding plate is disposed at least inside the second holding portion. According to such a configuration, after the light transmitted through the first lens group is dimmed by the dimming unit, the dimmed light is transmitted through the second lens group held at the design air interval. Therefore, good optical performance can be realized.

  According to the second aspect of the present invention, an imaging device with good optical characteristics is provided. The imaging apparatus includes the lens assembly described above, a blade driving unit that is disposed on the optical axis of the lens assembly, adjusts light transmitted through the lens group by driving the blade, and transmits the lens group. And an image sensor disposed on a surface on which the formed light is imaged.

  According to the third aspect of the present invention, an electronic apparatus including an imaging device with good optical characteristics is provided. This electronic apparatus includes the above-described imaging device.

  According to the present invention, a lens assembly capable of adjusting an air interval with a simple structure is provided.

FIG. 1 is a perspective view showing a smartphone incorporating an imaging apparatus according to an embodiment of the present invention. FIG. 2 is a perspective view showing a lens module in the imaging apparatus shown in FIG. FIG. 3 is an exploded perspective view of the lens module shown in FIG. FIG. 4 is a side view of the lens assembly shown in FIG. FIG. 5 is a cross-sectional view of the lens assembly shown in FIG. 4 taken along the line AA. FIG. 6 is an exploded perspective view of the lens assembly shown in FIG. FIG. 7 is an enlarged view showing the vicinity of the third lens in FIG. FIG. 8 is an enlarged view showing the vicinity of the fourth lens in FIG. FIG. 9 is an enlarged view showing the vicinity of the fifth lens in FIG. FIG. 10 is an enlarged view showing half of the lens assembly shown in FIG.

  Hereinafter, embodiments of an electronic apparatus including a lens assembly according to the present invention will be described in detail with reference to FIGS. 1 to 10. 1 to 10, the same or corresponding components are denoted by the same reference numerals, and redundant description is omitted. In addition, in FIGS. 1 to 10, the scale and dimensions of each component are exaggerated and some components may be omitted.

  FIG. 1 is a perspective view showing a smartphone 1 as an example of an electronic apparatus according to the present invention, and a camera 2 as an imaging device according to the present invention is incorporated in the smartphone 1. As shown in FIG. 1, the camera 2 includes a lens module 3 embedded in the back surface of the smartphone 1, and an imaging element (not shown) arranged on an imaging surface on which light transmitted through the lens module 3 forms an image. It has. The electronic device according to the present invention is not limited to the smartphone as described in this embodiment, and the present invention can be applied to various electronic devices such as a tablet computer, a laptop computer, and a drone. .

  2 is a perspective view showing the lens module 3, and FIG. 3 is an exploded perspective view. As shown in FIGS. 2 and 3, the lens module 3 includes a lens group 20 composed of a plurality of lenses, a lens holder 10 that holds the lens group 20, a blade drive unit 12 that drives the blades, and a lens holder. 10 and a cover body 14 attached to the blade driving unit 12. The lens assembly 4 according to the present invention includes a lens group 20 and a lens holder 10 that holds the lens group 20. In this specification, along the optical axis (X axis), the object side (−X direction side) is “front” or “front”, and the imaging surface side (+ X direction side) is “rear” or “rear”. It is defined as

  4 is a side view showing the lens assembly 4, FIG. 5 is a cross-sectional view taken along line AA of FIG. 4, and FIG. 6 is an exploded perspective view showing the lens assembly 4. As shown in FIGS. 5 and 6, the lens group 20 of the lens assembly 4 includes five lenses 21 to 25. As shown in FIG. 5, the five lenses 21 to 25 have the same optical axis L, and all of them are formed symmetrically with respect to the optical axis L. In the present embodiment, five lenses 21 to 25 (lens group 20) are held by the lens holder 10, but the number of lenses held by the lens holder 10 is not limited to this.

  As shown in FIGS. 4 and 5, the lens holder 10 includes a cylindrical first holding portion 31 that holds the two lenses 21 and 22 and a cylindrical first holding portion that holds the three lenses 23 to 25. 2 holding parts 32 and two connecting parts 33, 33 for connecting the first holding part 31 and the second holding part 32. The second holding part 32 has an outer diameter larger than that of the first holding part 31. The two lenses 21 and 22 (first lens 21 and second lens 22) held by the first holding unit 31 constitute, for example, a first lens group 41 (see FIG. 6) having a positive refractive power. The three lenses 23 to 25 (the third lens 23, the fourth lens 24, and the fifth lens 25) held by the second holding unit 32 are, for example, a second lens group having a negative refractive power. 42 (see FIG. 6).

  As shown in FIGS. 5 and 6, a first light shielding plate 80 is provided between the second lens 22 (front lens) and the third lens 23 (rear lens) (that is, between the lens pair 22 and 23). Is arranged. A second light shielding plate 81 is disposed between the third lens 23 (front lens) and the fourth lens 24 (rear lens) (that is, the lens pair 23, 24). Further, a third light shielding plate 82 is disposed between the fourth lens 24 (front lens) and the fifth lens 25 (rear lens) (that is, between the lens pair 24 and 25). The first light shielding plate 80 is in contact with the front surface of the third lens 23 and mainly shields stray light from the third lens 23. The second light shielding plate 81 is in contact with the front surface of the fourth lens 24 and mainly shields stray light from the fourth lens 24. The third light shielding plate 82 is in contact with the front surface of the fifth lens 25 and mainly shields stray light from the fifth lens 25.

  As shown in FIG. 5, a flange 34 extending inward in the radial direction is provided at the front end of the first holding portion 31 of the lens holder 10. The outer peripheral edge 21P of the first lens 21 is in contact with the rear end surface of the flange 34 of the first holding portion 31, whereby the first lens 21 is positioned in the optical axis direction (X direction). Further, the outer peripheral edge 22P of the second lens 22 is in contact with the rear end surface of the outer peripheral edge 21P of the first lens 21, whereby the second lens 22 is positioned in the optical axis direction. Further, a step is formed on the inner peripheral surface of the first holding portion 31 corresponding to the outer diameter of the first lens 21 and the outer diameter of the second lens 22, and the first lens 21 and the second lens 22 are formed. Are fitted into the inner peripheral side of the first holding part 31. As described above, the first lens 21 and the second lens 22 are fitted into the first holding portion 31, whereby the first lens 21 and the second lens 22 are positioned in a direction perpendicular to the optical axis.

  As shown in FIG. 5, the connecting portion 33 of the lens holder 10 extends radially inward from the inner diameter of the front edge of the second holding portion 32. A first light shielding plate 80 is in contact with the rear end surface of the connecting portion 33, and an outer peripheral edge 23P of the third lens 23 is in contact with the first light shielding plate 80 from the rear. As a result, the third lens 23 is positioned in the optical axis direction (X direction). Further, the outer peripheral edge 24P of the fourth lens 24 is in contact with the outer peripheral edge 23P of the third lens 23 from the rear, whereby the fourth lens 24 is positioned in the optical axis direction. Further, the third light shielding plate 82 is in contact with the outer peripheral edge 24P of the fourth lens 24 from the rear, and the outer peripheral edge 25P of the fifth lens 25 is in contact with the third light shielding plate 82 from the rear. As a result, the fifth lens 25 is positioned in the optical axis direction.

  As shown in FIG. 5, there are steps on the inner peripheral surface of the second holding portion 32 corresponding to the outer diameter of the third lens 23, the outer diameter of the fourth lens 24, and the outer diameter of the fifth lens 25. The third lens 23, the fourth lens 24, and the fifth lens 25 are respectively fitted on the inner peripheral side of the second holding portion 32. As described above, the third lens 23, the fourth lens 24, and the fifth lens 25 are fitted into the second holding portion 32, so that the third lens 23, the fourth lens 24, and the fifth lens 25 are fitted. Positioning in a direction perpendicular to the optical axis is performed.

  In this way, the first lens group 41 (that is, the first lens 21 and the second lens 22) is accommodated in the first holding portion 31 of the lens holder 10 in a positioned state, and the second holding unit 31 The second lens group 42 (that is, the third lens 23, the fourth lens 24, and the fifth lens 25) is accommodated in the portion 32 in a positioned state. Then, as shown in FIG. 5, the first lens 21, the second lens 22, and the like in order along the optical axis L from the object side (−X direction side) to be imaged toward the imaging surface (+ X direction side). The third lens 23, the fourth lens 24, and the fifth lens 25 are disposed. With such a configuration, between the first lens 21 and the second lens 22, between the second lens 22 and the third lens 23, Air spaces are formed between the third lens 23 and the fourth lens 24 and between the fourth lens 24 and the fifth lens 25, respectively. In the present specification, the “air interval” refers to an interval (space width) on the optical axis L between lenses adjacent in the optical axis direction.

  In the present embodiment, as shown in FIGS. 5 and 6, the shield 36 is disposed on the rear side of the fifth lens 25, which may cause the position of the fifth lens 25 to shift backward. It is effectively prevented.

  Further, by arranging the light shielding plate 80 on the rear end surface of the connecting portion 33, the reflected light reflected by the end surface of the opening 54 of the aperture portion 51 and the space between the first holding portion 31 and the second holding portion 32 (insertion). The stray light generated in the (part)) can be appropriately shielded.

  The blade drive unit 12 described above adjusts the light that is transmitted through the first lens group 41 and incident on the second lens group 42 by driving the blade. In this embodiment, the diaphragm blade is used. Thus, the light incident on the second lens group 42 is configured to be reduced. Specifically, as shown in FIG. 3, the blade driving unit 12 drives the diaphragm blade 51 (light control unit) in which two diaphragm blades (not shown) are housed, and the diaphragm blades. The base 52 in which the drive circuit and the drive mechanism are housed, and frame portions 53 and 53 extending from the base 52 to the side of the lens holder 10, respectively. An aperture 54 through which light passes is formed in the diaphragm 51. The two diaphragm blades accommodated in the diaphragm 51 are driven so as to close the opening 54 of the diaphragm 51, thereby realizing an arbitrary aperture diameter. The diaphragm 51 may be changed to a predetermined opening diameter for each step, or may be changed in a stepless manner.

  The aperture 51 in the present embodiment extends in the + Z direction from the upper surface 52A of the base 52, and a frame 53 extends from the base 52 substantially parallel to the aperture 51. A front side surface 53 </ b> A of the frame portion 53 is substantially parallel to the side surface 33 </ b> A of the coupling portion 33 of the lens holder 10.

In the present embodiment, the diaphragm unit 51 is disposed between the first lens group 41 and the second lens group 42, that is, between the second lens 22 and the third lens 23. More specifically, as shown in FIG. 4, the thickness D in the X direction of the connecting portion 33 of the lens holder 10 is slightly larger than the thickness T _D in the X direction of the diaphragm 51 (see FIG. 3). It has become. Further, as shown in FIG. 5, the shortest distance W along the Y direction between the two connecting portions 33, 33 of the lens holder 10 is larger than the width T _W of the diaphragm 51 in the Y direction (see FIG. 3). Slightly larger. As described above, the connection portion 33 of the lens holder 10 forms an insertion space S (see FIG. 5) in which the diaphragm portion 51 of the blade driving portion 12 can be inserted between the second lens 22 and the third lens 23. Has been. As shown in FIG. 3, the aperture portion 51 of the blade driving unit 12 is inserted in the insertion space S in the + Z direction, and the cover body 14 is covered from above the inserted blade driving unit 12. 3 is configured.

  In the present embodiment, the blade driving unit 12 (aperture unit 51) is arranged between the first lens group 41 and the second lens group 42 with the above-described configuration. Then, the blade driving unit may be disposed in front of the front end portion of the lens holder (that is, between the lens holder and the object), or rearward of the rear end portion of the lens holder (that is, the lens holder and the image sensor). Between the two).

  Next, the first light shielding plate 80, the second light shielding plate 81, and the third light shielding plate 82 described above will be described in more detail. 7 is an enlarged view showing the vicinity of the third lens 23 in FIG. 5, FIG. 8 is an enlarged view showing the vicinity of the fourth lens 24, and FIG. 9 is an enlarged view of the vicinity of the fifth lens 25. FIG. 10 is an enlarged view of the −Y direction side portion (the −Y direction side portion from the optical axis L) of FIG.

  As shown in FIGS. 6 and 7, the first light shielding plate 80 has an outer peripheral edge 80A and an inner peripheral edge 80B, and is formed in a hollow disk shape. The first light shielding plate 80 is formed so that the diameter of the outer peripheral edge 80 </ b> A is slightly shorter than the outer diameter of the third lens 23. On the other hand, as shown in FIG. 7, the front lens surface 23F of the third lens 23 includes an effective lens surface 23E that includes a range of the effective diameter of the front lens surface 23F. The first light shielding plate 80 is formed so that the diameter of the inner peripheral edge 80B is larger than the diameter of the effective lens surface 23E. With such a configuration, as shown in FIG. 10, the first light shielding plate 80 contacts the front lens surface 23F outside the effective lens surface 23E and inside the inner peripheral surface 10A of the lens holder 10, and the lens holder The ten connecting portions 33 are in contact with the rear end surface 33R.

  According to the present embodiment, such a first light shielding plate 80 is interposed between the third lens 23 and the rear end surface 33R of the connecting portion 33, so that as shown in FIG. The air space between the third lens 23 is increased by the thickness d1 (see FIG. 7) of the first light shielding plate 80 in the X direction, and as a result, the design air whose air space is the design value. The interval G1 is adjusted.

  As shown in FIGS. 6 and 8, the second light shielding plate 81 has an outer peripheral edge 81A and an inner peripheral edge 81B, and is formed in a hollow disk shape. Further, the second light shielding plate 81 is formed so that the diameter of the outer peripheral edge 81 </ b> A is shorter than the outer diameter of the fourth lens 24. On the other hand, as shown in FIG. 8, the front lens surface 24F of the fourth lens 24 includes an effective lens surface 24E that includes a range of the effective diameter of the front lens surface 24F. The second light shielding plate 81 is formed so that the diameter of the inner peripheral edge 81B is larger than the diameter of the effective lens surface 24E. With such a configuration, as shown in FIG. 10, the second light shielding plate 81 is in contact with the front lens surface 24 </ b> F outside the effective lens surface 24 </ b> E and inside the inner peripheral surface 10 </ b> A of the lens holder 10. The lens 23 is in contact with the rear lens surface 23R.

  According to the present embodiment, since the second light shielding plate 81 is interposed between the third lens 23 and the fourth lens 24, the third lens 23 and the fourth lens as shown in FIG. 24 is increased by the thickness d2 (see FIG. 8) in the X direction of the second light shielding plate 81, and as a result, the air interval is set to a design air interval G2 which is a design value. It has been adjusted.

  As shown in FIGS. 6 and 9, the third light shielding plate 82 has an outer peripheral edge 82A and an inner peripheral edge 82B, and is formed in a hollow disk shape. Further, the third light shielding plate 82 is formed so that the diameter of the outer peripheral edge 82 </ b> A is slightly shorter than the outer diameter of the fifth lens 25. On the other hand, as shown in FIG. 9, the front lens surface 25F of the fifth lens 25 includes an effective lens surface 25E including the range of the effective diameter of the front lens surface 25F. The third light shielding plate 82 is formed such that the diameter of the inner peripheral edge 82B is larger than the diameter of the effective lens surface 25E. With such a configuration, as shown in FIG. 10, the third light shielding plate 82 contacts the front lens surface 25 </ b> F outside the effective lens surface 25 </ b> E and inside the inner peripheral surface 10 </ b> A of the lens holder 10. The lens 24 is in contact with the rear lens surface 24R.

  According to the present embodiment, since the third light shielding plate 82 is interposed between the fourth lens 24 and the fifth lens 25, the fourth lens 24 and the fifth lens as shown in FIG. 25 is increased by the thickness d3 (see FIG. 9) of the third light shielding plate 82 in the X direction, and as a result, this air gap becomes the design air gap G3, which is a design value. It has been adjusted.

  As shown in FIG. 9, the rear lens surface 25R of the fifth lens 25 includes a rear end portion 25A that projects rearward from any other portion of the rear lens surface 25R. As shown in FIG. 10, when the light shielding plates 80 to 82 in the present embodiment are arranged in the lens holder 10, the rear end portion 25 </ b> A of the fifth lens 25 has the rear end surface 37 of the lens holder 10 depending on the thickness thereof. It is formed in a thickness that does not protrude beyond the rear. In other words, as shown in FIG. 10, the rear end portion 25 </ b> A is located on the inner side (front side) than the rear end surface 37 of the lens holder 10 even when the light shielding plates 80 to 82 are disposed.

  As described above, according to the lens assembly 4 in the present embodiment, since the light shielding plates are arranged between the lenses, stray light from the lenses is effectively shielded by these light shielding plates, and good optical performance is obtained. Realized. In addition, the light shielding plates 80 to 82 in the present embodiment are positioned outside the effective lens surfaces (effective lens surfaces 23E, 24E, and 25E) of the respective rear lenses (the third lens 23, the fourth lens 24, and the fifth lens 25). Therefore, the light transmitted through the second lens group 42 is prevented from being blocked by these light shielding plates 80 to 82.

  Further, according to the lens assembly 4 in the present embodiment, when the air gap deviates from the design air gap due to tolerance during assembly, the light shielding plate has a thickness corresponding to this deviation (ie, an appropriate thickness). By disposing the lens between the lenses, it is possible to eliminate the deviation and adjust the air interval to the designed air interval. As described above, according to the lens assembly 4 in the present embodiment, stray light is effectively blocked and the air interval is adjusted to the designed air interval. Therefore, the lens assembly 4 is used as an imaging device such as a camera. By incorporating it, an imaging device having good optical performance can be configured.

  Further, according to the lens assembly 4 in the present embodiment, the air gap can be adjusted to the designed air gap simply by incorporating a light shielding plate having an appropriate thickness between the lenses. It is not necessary to separately attach the adjustment member to the lens holder. As described above, according to the present embodiment, since the air interval can be adjusted with a simple structure, the lens assembly can be reduced in size, and a small electronic device such as a mobile phone, a drone, or an in-vehicle camera. Can also be easily applied.

  Further, according to the lens assembly 4 in the present embodiment, the air space can be adjusted to the designed air space by arranging a light shielding plate having an appropriate thickness between the lenses, so that a lens holder or the like can be used to adjust the air space. There is no need to redesign a mold or the like for forming. Therefore, manufacturing cost, manufacturing time, labor, etc. are effectively reduced.

  Further, according to the lens assembly 4 in the present embodiment, the thickness of the light shielding plate can be appropriately adjusted as described above. That is, when the light shielding plate is incorporated into the lens holder, the rear end portion (rear end portion 25A) of the lens (the fifth lens 25) located at the rearmost portion protrudes from the rear end surface of the lens holder depending on the thickness of each light shielding plate. The thickness of each light shielding plate can be adjusted so that there is no such thing. Therefore, when the lens holder moves in the optical axis direction by, for example, autofocusing, the rearmost lens is prevented from coming into contact with the image sensor. Further, it is possible to prevent the lens from coming into contact with other members when the imaging device is manufactured.

  In the above-described embodiment, one light shielding plate (between the lenses 22 and 23) is provided between the lenses (between the lenses 22 and 23, between the lenses 23 and 24, and between the lenses 24 and 25). The example of adjusting the air gap by incorporating the light shielding plate 81 between the light shielding plate 80 and the lenses 23 and 24 and the light shielding plate 82 between the lenses 24 and 25 has been described. The plate shields stray light from the lens and adjusts the air space between the lenses to the designed air space by appropriately changing its thickness. Therefore, in another embodiment, in order to adjust the air interval to the design air interval, a plurality of light shielding plates may be arranged in an overlapping manner between each lens (or at least one). For example, it is possible to adjust the air spacing more finely by forming individual light shielding plates thinner than in the above-described embodiment and arranging a plurality of such thin light shielding plates between the lenses. In another example, two light shielding plates having different thicknesses may be appropriately combined so as to have a design air interval.

  In the above-described embodiment, the example in which the light shielding plate is incorporated between the lenses 22 and 23, between the lenses 23 and 24, and between the lenses 24 and 25 has been described. The light shielding plate may be incorporated in only one or two of 22, 23, between the lenses 23, 24, and between the lenses 24, 25. Further, a light shielding plate may be incorporated between the first lens 21 (front lens) and the second lens 22 (rear lens). However, in the present embodiment in which the diaphragm 51 (the dimming unit) is inserted between the first lens group 41 and the second lens group 42, a light shielding plate is disposed inside the second holding unit 32. It is preferable to do. According to such a configuration, the light is dimmed by the diaphragm 51, and the dimmed light is transmitted through the second lens group 42 held at the design air interval. Become very good.

  Note that the terms “above”, “front”, “rear”, “front”, “rear” and other positional relationships used in this specification are used in the context of the illustrated embodiment. It changes depending on the relative positional relationship of the apparatus.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and it goes without saying that the present invention may be implemented in various forms within the scope of the technical idea.

1 Smartphone (electronic equipment)
2 Camera (imaging device)
3 lens module 4 lens assembly 10 lens holder 10A inner peripheral surface 12 blade drive unit 14 cover body 20 lens group 21 first lens 22 second lens 23 third lens 23E effective lens surface 23F front lens surface 23R rear lens surface 24 first 4 lenses 24E effective lens surface 24F front lens surface 24R rear lens surface 25 fifth lens 25A rear end (rear end of lens group)
25E Effective lens surface 25F Front lens surface 25R Rear lens surface 31 First holding part 32 Second holding part 33 Connecting part 34 Flange 36 Shield 37 Rear end face 41 First lens group 42 Second lens group 51 Aperture part ( Light control unit)
52 Base 53 Frame 54 Opening 80 First light shielding plate 80A Outer peripheral edge 80B Inner peripheral edge 81 Second light shielding plate 81A Outer peripheral edge 81B Inner peripheral edge 82 Third light shielding plate 82A Outer peripheral edge 82B Inner peripheral edge G1 to G3 Design air interval L Optical axis S Insertion space

Claims (9)

A lens group including a plurality of lenses;
A lens holder for holding the lens group;
And at least one light shielding plate for shielding stray light from the lens group,
The lens group includes at least one lens pair including an anterior lens and an posterior lens adjacent to each other with an air gap in the optical axis direction,
The light shielding plate is disposed between the front lens and the rear lens in at least one of the at least one lens pair,
The lens assembly, wherein the air interval is adjusted to a design air interval that is a design value according to a thickness of the light shielding plate in the optical axis direction.   2. The lens assembly according to claim 1, wherein the thickness of the light shielding plate is adjusted such that a rear end portion of the lens group in the optical axis direction is positioned inside the lens holder.   The lens assembly according to claim 1, wherein the light shielding plate is formed to have an outer diameter that is equal to or smaller than an inner diameter of the lens holder and that is larger than an effective diameter of the rear lens.   4. The lens assembly according to claim 1, wherein the one light shielding plate is disposed between the front lens and the rear lens. 5.   The lens assembly according to any one of claims 1 to 3, wherein a plurality of the light shielding plates are disposed between the front lens and the rear lens.   The lens assembly according to claim 5, wherein two light shielding plates are disposed between the front lens and the rear lens. The lens group is
A first lens group located on the front side in the optical axis direction;
A second lens group located on the rear side in the optical axis direction,
The lens holder is
A first holding unit for holding the first lens group;
A second holding unit for holding the second lens group;
A connecting portion that connects the first holding portion and the second holding portion so as to form an insertion space in which a light control portion can be inserted between the first holding portion and the second holding portion. And
The lens assembly according to claim 1, wherein the light shielding plate is disposed at least inside the second holding portion. A lens assembly according to any one of claims 1 to 7;
A blade driving unit that is disposed on the optical axis of the lens assembly and adjusts the light transmitted through the lens group by driving the blade;
An imaging device comprising: an imaging element disposed on a surface on which light transmitted through the lens group forms an image.   An electronic apparatus comprising the imaging device according to claim 8.

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